Air diffuser



FIG. 1 is a front perspective view of an air diffuser showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is an enlarged partial cross-sectional view thereof, taken along the lines 7--7 in FIG. 2, with the remaining portion shown in elevation and shown broken away for ease of illustration. 

The ornamental design for an air diffuser, as shown and described. 